Pardon my commenting on a discussion that's a little over my head, but
if I understand the architechtural differences between Opteron and
Pentium/Xeon, wouldn't the latency difference between them be
attributed at least in part to the on-die memory controller?
On 8/14/06, Stuart Midgley <sdm900 at gmail.com> wrote:
> actually, latency determines bandwidth more than memory speed... see
> my rant(?) from a little over a year ago
>>http://www.beowulf.org/archive/2005-July/013294.html>> prefetch etc. help, but the limiting factor is still latency. Hence
> the opterons have significantly higher real memory bandwidth (their
> latency is about 1/3 that of xeons/p4's etc). If you look at the
> ia64's then they have even high latency again, but they can have a
> huge number of outstanding loads (from memory its >80), so their
> effective bandwidth is high.
>> Stu.